Method for producing a decorative object from at least one extruded bead layer

Abstract

A method for producing a decorative object from at least one extruded bead layer, including a step of passing a polymer-based composition into an extrusion die, the extrusion head controlled by a control element to follow a continuous trajectory intended to form the decorative object in one layer, the control element controlling a variation in the speed V of movement of the extrusion head on the basis of a variation in the trajectory of the extrusion head by an angle α and, at a distance D from a change in angle α, the continuous trajectory of the extrusion head complies with the following equation, for each of the layers forming the decorative object, where appropriate: D=a+(b×Vc)+(d×a) where a, b, c and d are constants.

1 - 10 . (canceled) 
     
     
         11 . A method for producing a decorative object from at least one layer of an extruded bead of a polymer-based composition, comprising a step of: passing a polymer-based composition into an extrusion die from a feed inlet of said composition to an extrusion head from which an extruded bead of said composition comes out, the extrusion bead being deposited on a receiving support by gravitational effect,
 wherein the extrusion head is controlled by control means to follow a continuous trajectory intended to form said decorative object in one layer, said control means controlling a variation in a speed V of movement of the extrusion head on the basis of a variation in the trajectory of the extrusion head by an angle α and in that, at a distance D from a change in angle α, the continuous trajectory of the extrusion head complies with the following equation, for each of the layers forming the decorative object:   
       
         
           
             
               D 
               = 
               
                 a 
                 + 
                 
                   ( 
                   
                     b 
                     × 
                     Vc 
                   
                   ) 
                 
                 + 
                 
                   ( 
                   
                     d 
                     × 
                     α 
                   
                   ) 
                 
               
             
           
         
         where a, b, c and d are constants according to the following values
     a= 10.6±10%
 
     b= 2.76−05±10%
 
     c= 2.72±10%
 
     d=− 0.08±10%
 
 
         where D is expressed in millimeters, V in millimeters per second and α in degrees. 
       
     
     
         12 . The method according to  claim 11 , wherein the constants a, b, c and d are expressed according to the following values
     a =10.6±5%
       b= 2.76−05±5%
       c= 2.72±5% and
       d=− 0.08±5%
   
     
     
         13 . The method according to  claim 12 , wherein a robotic arm, controlled by the control means, includes a means for storing a volume of the polymer-based composition as well as means for transporting said polymer to the extrusion head. 
     
     
         14 . The method according to  claim 13 , wherein the extrusion die is mounted at one end of the robotic arm. 
     
     
         15 . The method according to  claim 13 , wherein the extrusion die is mounted at a distance from the robotic arm such that only said extrusion head is moved to follow the continuous trajectory. 
     
     
         16 . The method according to  claim 11  claims, wherein the polymer-based composition comprises a polymer matrix including at least 70% by weight of acrylonitrile butadiene styrene (ABS), polylactic acid (PLA polyester), polycarbonate (PC) or Polyethylene terephthalate (PET). 
     
     
         17 . The method according to  claim 11 , wherein the speed V of the extrusion die is based on the output extruded by the extrusion die. 
     
     
         18 . The method according to  claim 11 , wherein the extruded bead comes out of the head die with an output between five and fifteen kilos per hour. 
     
     
         19 . The method according to  claim 11 , wherein the extruded bead has, at the extrusion head outlet, a viscosity between four hundred and four hundred and fifty Pascal per second defined as per the ISO 11443 standard. 
     
     
         20 . The method according to  claim 11 , wherein the temperature of the extruded bead, at the extrusion head outlet, is between 160° C. and 260° C.